Joeann friedrich christopher grw



(No Model.)

J. P. O. GRUN. DEVICE FOR TURNING MUSIC SHEETS.

No 444,380. Patented Jan.6,1891.

UNITED STATES PATENT OFFICE.

JOHANN FRIEDRICH CHRISTOPHER GRIIN, OF HAMBURG, GERMANY.

DEVICE FOR TURNING MUSIC-SHEETS.

SPECIFICATION forming part of Letters Patent N 0. 444,380, dated January6, 1891.

Application filed April 8, 1890. Serial No. 347,158. (No model.)

To aZZ whom it may concern: 7

Be it known that I, J OI-IANN FRIEDRICH CHRISTOPHER Gain, a subject ofthe El11- peror of Germany, and aresident of Hamburg, Germany, haveinvented a new and useful Improvement in Devices for Turning Music-Sheets, of which the following is a specification.

The object of this invention is to provide a device for mechanicallyreversing musicsheets while playing, which is operated by pulling a cordor depressing a pedal connected therewith.

Reference is had to the accom panyin g drawin gs, in which like lettersdesignate like parts.

Figures 1 and 2 are perspective views, and Figs. 3 and at end views fromthe left and right, respectively, of the improved device.

The prismatic guide-piece A, serving to carry the mechanism, is securedto the musicdesk P by means of two holders a, which are introduced intotubes 1) provided on the desk, said guide-piece being thereforeadjustable to the thickness of the respective music-book N.

In the piece A refe red to is securely guided a slide-block B, to theunder side of which is attached an eye or loop 0, serving to re ceivethe cord (Z and a nut c. Said loop and nut project through slots in thebottom side of the guide-piece, on which is provided between twoangle-pieces, a core or red g, surrounded by a helical spring 71 On saidcore slides the nut c on the forward movement of the slideblock, andcompresses the spring 71, which, on the cord or pedal being released,throws back he slide-block.

On the upper side of the block is provided, revoluble about a pin 2',the fold-producer 7c, the nave of which is rigidly connected with thepinion Z, gearing into a rack-bar m. At the other end of the slide-blockis pivoted,in a block a, the sheet-reverser, consisting of theturning-rod O and the toothed segment 0, adapted to engageinto atoothedbar 1) after the fold-producer has made one quarterrevolutiou, and thento complete the stroke simultaneously with the latter, the fold-producer, however, moving in the horizontal and the reverser in theapproximately vertical plane.

The mechanism for turning back musicsheets for repetition consists of asecond reverser q, turning in a block '0. The latter is mounted on ashort slide-block O, likewise movable in piece A and adapted to becoupled with the longer slide-block I by aid of a pivoted pin 5, whichis connected with a twoarrned lever 25, having its fulcrum in block 1;.The two slide-blocks are coupled and uncoupled by respectivelydepressing the knob t or F. The toothed segment of the reverser q moveswith the forward stroke in a toothed bar "u, thereby causing thereverser q to be moved in a similar manner as the turning-rod O.

The improved music-sheet reverser is operated as follows: By pulling thecord (Z by means of the pedal or otherwise the fold-pro d ucer 7a isturned to the left and the musicsheet bulged up, Fig. l. The reverser O,which now rises, enters into the bulging produced, turns the sheet over,and, owing to its peculiar movement, smooths the same, while thefold-producer completes its revolution as far as two hundred and seventydegrees. In this final position, which is illustrated in Fig. 2, theslide-block O can be coupled with block B by depressing the knob '6,thereby causing the pivoted pin .9 to catch in any suitable manner intoblock B. On releasing the cord the repetition-reverser q is turned tothe right with the reverser O, which resumes its inoperative position,and all sheets lying on the repetition-reverser are turned backsimultaneously.

hat I claim is-- In a device for turning music-sheets, the combination,with a fold-producer 7., revoluble about pin '2', and pinion Z, rigidlyconnected thereto and gearing with rack-bar m, of slide-blocks B and O,adapted to be moved by aid of a pedal, cord, and spring device in aguide-piece A, a sheet-reverser pivoted in a block n, and consisting ofa turning-rod O and a toothed segment O, adapted to gear into a toothedbar 17, a repetition-reverser mounted on slide-block O, and consistingof a reversingrod q, connected with a toothed segment gearing into arack-bar, a two-armed lever I, having its fulcrum in a block b, and apivoted pin .9, adapted to engage the slideblock B, substantially as andfor the purpose set forth.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

JOHANN FRIEDRICH CHRISTOPHER G-RUN.

Witnesses:

FRITZ HAMMER, CARL Wales.

